Frost dates for Brackettville, TX
At Brackettville, the median last spring frost (32°F) is Mar 5 and the median first fall frost is Nov 24, for a typical growing season of 264 days. For a 90% chance that the last frost has passed, wait until Mar 26. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 5Last spring frost (median)50% chance of 32°F after this date
- Mar 26Safer planting date10% chance of 32°F after this date
- Nov 24First fall frost (median)50% chance of 32°F by this date
- 264 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 9a (20 to 25°F) · see all zone 9a frost dates
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Feb 26 | Mar 18 | Apr 5 |
| 32°F | Feb 7 | Mar 5 | Mar 26 |
| 28°F | Jan 17 | Feb 16 | Mar 15 |
| 24°F | Dec 22 | Jan 27 | Mar 4 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 28 | Nov 12 | Dec 2 |
| 32°F | Nov 3 | Nov 24 | Dec 15 |
| 28°F | Nov 12 | Dec 6 | Jan 5 |
| 24°F | Nov 26 | Dec 24 | Jan 28 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 212 days | 239 days | 268 days |
| 32°F | 234 days | 264 days | 294 days |
| 28°F | 258 days | 291 days | 331 days |
| 24°F | 290 days | 329 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 87% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78832 | 9a | 20 to 25°F | 11 km |
| 78802 | 9a | 20 to 25°F | 51 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00411007, at 29.3167, -100.4144, elevation 341 m (1,120 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 24.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Brackettville 22 N (33 km)
- Del Rio Intl Airport (50 km)
- Del Rio 4NW (51 km)
- Camp Wood (55 km)
- Carta Valley (58 km)
- Amistad Dam (62 km)
- Eagle Pass 3N (63 km)
- Rocksprings (81 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.